Pickett 400 ES Business Rule

Here is the User Manual 1959 edition for this model:

Pickett_ModelNo400_BusinessSlideRuleManual_ScanByGregScott.pdf

Click on the next link to see professional panoramic pictures of the 400 ES model

Model 400-ES

https://www.sliderulemuseum.com/Pickett/Pickett_Model_400-ES_BusinessSlideRule_GregScottCollection.jpg

Images from The International Slide Rule Museum

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